The problem can be corrected by upgrading the affected package to version 1.4.4-0ubuntu2.1. After a standard system upgrade you need to restart Epiphany to effect the necessary changes.

Details follow:

USN-155-1 fixed some security vulnerabilities of the Mozilla suite. Unfortunately this update caused regressions in the Epiphany web browser, which uses parts of the Mozilla browser. The updated packages fix these problems.